Autonomous system detail

AS1251

Announced

AS1251 announces 41 IPv4 and 1 IPv6 prefixes and peers with 18 other networks.

Summary

// analyst note
A single combined snapshot from route-views2 and route-views6 shows route visibility at 2026-11-03T14:00:00.000Z; observed AS_PATH neighbors do not establish commercial relationships.
IPv4 prefixes
41
~132.9K addresses
IPv6 prefixes
1
announced
Peer networks
18
0 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: Low  ·  3 sources  ·  How this page is checked

AS1251 is an ASN with routes visible in the 2026-11-03 14:00 UTC combined Route Views snapshot; its operator and operational purpose are unknown from the supplied evidence. The snapshot shows 41 IPv4 prefixes and one IPv6 prefix, covering an estimated 128,512 IPv4 addresses. These figures describe that observation only, not current deployment or traffic prevalence.

IANA places AS1251 within the resource range 1–1876, which it identifies as assigned by ARIN. This identifies the allocating regional registry for the block; it does not provide an individual assignment record, organization, country, or website. No first-party organizational material is supplied to connect an operator or product to this ASN.

The combined observation records 18 AS_PATH neighbor values. They can help identify candidate routes when investigating this snapshot, but they do not establish verified peers, providers, customers, or commercial relationships. For identification, compare the exact prefixes and paths against a timestamped routing view and seek an authoritative registry or first-party statement explicitly linking an organization to AS1251. The supplied evidence supports no security or reputation conclusion.

Observed routing
41 IPv4 prefixes and 1 IPv6 prefix in the combined Route Views observation at 2026-11-03 14:00 UTC.
Identity
Operator, country, purpose, and website are unknown from the supplied evidence.
Triage
The snapshot documents route visibility only; it does not establish ownership, traffic prevalence, or safety.
Operator
Unknown [Unknown] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
Country
Unknown [Unknown] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv

Network & routing

Routing observation
41 IPv4 prefixes, 1 IPv6 prefix, and 128512 estimated IPv4 addresses, combined across route-views2 and route-views6 at 2026-11-03T14:00:00.000Z [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
ASN
1251 [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
Allocating RIR
ARIN; IANA places the ASN in range 1–1876 [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
AS_PATH neighbors
18 observed values; these are not verified peers or relationship classifications [Confirmed] — https://archive.routeviews.org/route-views6/bgpdata/2026.11/RIBS/rib.20261103.1400.bz2
[ 02 ] — Announced prefixes

What this network routes.

42 prefixes total · as observed by RouteViews at 2026-11-06 · one collector view, not a global census
// IPv4 prefixes41
  1. 143.108.0.0/16/16
  2. 200.136.32.0/19/19
  3. 200.136.64.0/19/19
  4. 200.136.16.0/20/20
  5. 200.136.160.0/20/20
  6. 200.136.96.0/20/20
  7. 200.144.128.0/20/20
  8. 200.144.32.0/20/20
  9. 200.144.80.0/20/20
  10. 200.18.240.0/20/20
  11. 200.18.48.0/20/20
  12. 200.19.80.0/20/20
  13. 143.108.8.0/22/22
  14. 200.136.184.0/22/22
  15. 200.144.120.0/22/22
  16. 200.144.64.0/22/22
  17. 200.144.68.0/22/22
  18. 200.19.224.0/22/22
  19. 200.10.178.0/23/23
  20. 200.136.182.0/23/23
  21. 200.136.26.0/23/23
  22. 200.144.126.0/23/23
  23. 200.144.78.0/23/23
  24. 200.18.110.0/23/23
  25. 200.18.48.0/23/23
  26. 200.19.228.0/23/23
  27. 143.108.12.0/24/24
  28. 200.10.178.0/24/24
  29. 200.10.179.0/24/24
  30. 200.136.110.0/24/24
  31. 200.136.176.0/24/24
  32. 200.136.80.0/24/24
  33. 200.136.81.0/24/24
  34. 200.136.88.0/24/24
  35. 200.144.118.0/24/24
  36. 200.144.119.0/24/24
  37. 200.144.124.0/24/24
  38. 200.144.125.0/24/24
  39. 200.18.252.0/24/24
  40. 200.18.52.0/24/24
  41. 200.6.42.0/24/24
// IPv6 prefixes1
  1. 2001:12d8::/32/32
[ 03 ] — Notable peers & upstreams

Who it talks to.

18 observed neighbours
// Notable connections18 of 18 observed

Neighbours observed by RouteViews at 2026-11-06, lowest ASN first. Relationships are inferences from the CAIDA AS Relationships Dataset, 2026-08-01, and establish no commercial arrangement; a dash means the inference did not resolve.

ASNOperatorRole
AS1916 — —
AS6939 Hurricane Electric LLC —
AS11097 — —
AS15830 — —
AS20080 — —
AS28222 — —
AS28571 — —
AS52888 — —
AS52890 — —
AS52914 — —
AS52992 — —
AS53166 — —
AS53187 — —
AS61612 — —
AS262742 — —
AS263605 — —
AS265478 — —
AS271755 — —
Neighbours observed via public BGP collectors; not a complete peering list.